Welcome to Project-GC Q&A. Ask questions and get answers from other Project-GC users.
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It is a function that is already available, but only for paying members of Project-GC. See more about this on http://project-gc.com/Home/Membership
When you are a paying member of Project-GC, you will find a small listbox icon at the far end of the Cache Location line of pages. Click this and you can select multiple locations.